Looking to reinforce their bullpen after a doubleheader, the Rockies have promoted Bruce Billings for a long relief role and are strongly considering bringing Double-A fireballer Juan Nicasio to start Saturday.

Billings is in Denver and is expected to be activated today when Jorge De La Rosa lands on the disabled list with a torn elbow ligament that will require season-ending surgery.

Billings has been a regular in the Triple-A rotation. In 18 appearances for the Sky Sox this season, he’s 2-2 with a 5.06 ERA.

Though old for the league, Nicasio has nonetheless dominated Double-A competition. He’s sitting around 94 mph with his fastball while touching 101 mph. His slider is a work in progress, but an improved changeup suggests he could be ready for a big-league start.

Nicasio started once in spring training and struggled against Oakland. There are mixed opinions in the organization and among scouts on whether he’s best suited for starting or relieving.

With Tulsa this season, Nicasio is 5-1 with a 2.22 ERA. He leads Tulsa with 61 strikeouts — nearly double the next nearest pitcher.

The Billings’ move could be the first of several in the coming days. If Nicasio is activated Saturday, Billings could return to Triple-A. Then after Greg Reynolds presumably starts on Sunday, he could go out to make room for Aaron Cook. And of course, there’s the case of dominant Triple-A left-handed reliever Rex Brothers and just where he fits into the equation. He’s likely to be up no later than June 1.

So, there are a lot of moving parts. For now Billings will take De La Rosa’s spot, with more moves to follow.